“The Romney campaign didn’t just discover Pennsylvania — we knew it was going to be like this,” Maryland Gov. Bob Ehrlich said at the campaign’s Bethlehem stop.

Obama for America called the campaign’s push a “desperate Hail Mary play” and countered that no independent poll has the state’s presidential race tied. Republicans at the Bethlehem rally cited a Romney internal poll and a poll conducted by Susquehanna Polling & Research, labeled a Republican poll by some.

Democrats turned to their own store of politicians with star power in Pennsylvania. Former President Bill Clinton campaigned for Obama today in Pittsburgh and Philadelphia before heading north to Scranton for a nighttime appearance.

“The America I have been fighting for since I was a boy is on the line,” Clinton told the crowd at the University of Pennsylvania’s Palestra sports arena. “The future of America in the 21st century is on the line. ... I want you to wake up in the morning with a smile on your face, a song in your heart and a spring in your step, because America is coming back.”

No Democrat has won the presidency without Pennsylvania in 64 years. Pennsylvanians also will decide a U.S. Senate race in Tuesday’s election that could help determine control of the chamber.

Giuliani and Ehrlich also appeared with former U.S. Sen. Norm Coleman, of Minnesota, and actor Jon Voight. They made several other stops in the state today, including Scranton, Wilkes-Barre and Conshohocken. Giuliani said he found enthusiasm strong in the state.

“It’s going to be quite a surprise — Mitt Romney is going to win this election,” Giuliani said in Bethlehem. “It’ll be an extra nice and a real kick in the you-know-what if Pennsylvania votes for Mitt Romney.”

Northampton County Republican Committee Chairman Robert Kerr said the committee had 350 volunteers signed up for get-out-the-vote efforts on Tuesday and encouraged those at Giuliani’s appearance to join them. The appearance at the Lehigh Valley Republican campaign office in the Westgate Mall featured a table piled high with Romney doorknob hangers for attendees to take home and distribute.

U.S. Rep. Charlie Dent, R-Lehigh Valley, who also is up for re-election on Tuesday, predicted Romney would win both Pennsylvania and Ohio. He urged the crowd to do all they can to get Republicans to the polls Tuesday.

“If you know someone who needs a ride to the polls — don’t call the office. Just take them — that’s what you can do,” Dent said.